#include <Servo.h>

int butt_1 = A1;
int butt_2 = A2;
int LED_1 = 5;
int LED_2 = 4;
float step = 1.0f;
float pos = 0.0f;

Servo ser;

void setup()
{
ser.write(pos);
ser.attach(2);

pinMode(butt_1, INPUT_PULLUP);
pinMode(butt_2, INPUT_PULLUP);
pinMode(LED_1, OUTPUT);
pinMode(LED_2, OUTPUT);

}

void loop()
{ 
  if (digitalRead(butt_1) == LOW && digitalRead(butt_2) == LOW)
  {
    digitalWrite(LED_2, HIGH);
  }
  if (digitalRead(butt_1) == HIGH && digitalRead(butt_2) == HIGH)
  {
    digitalWrite(LED_2, LOW);
    digitalWrite(LED_1, HIGH);
  }
  if (!digitalRead(butt_1))
  {
    if (pos > 0)
    {
      pos -= step;
      ser.write(pos);
      digitalWrite(LED_1, LOW);
      digitalWrite(LED_2, HIGH);
      delay(10);
    }
  }
  if (!digitalRead(butt_2))
  {
    if (pos < 180)
    {
      pos += step;
      ser.write(pos);
      digitalWrite(LED_1, LOW);
      digitalWrite(LED_2, HIGH);
      delay(10);
    }
  }
}